This is the 3 pulley early blacktop setup with the anti whip pulley that goes down near the main crank pulley to give better engagement of the crank pulley and less bekt whip oj its way up to the idler.now llease note in this kit the idler next to the tensioner is 70mm not the later size of 60mm ib the kit with no anti whip pulley.so furthernore the alloy side casibgs are different inside to allow room for the larger 70mm pulley.so if your fitti g this kit to upgrade from the 2 pice kit then you will need to clearance your alloy side casing with a die grinder or similar ....remember theres no upgrade in life without a little bit of leg work ! 
This kit also features our uprated aolid tensioner to stop tensioner flap at high rpm and the heavy duty gates rpm blue belt ! 
Gates belt 
Ina pulleys 
No other belts protect your engine while delivering powerfully high performance like Gates® Racing, Performance, Muscle (RPM) Timing Belts. Gates RPM Timing Belts are incredibly strong and extremely heat resistant, engineered to take on high speeds and rapid accelerations. Constructed of HNBR elastomeric composites, Gates RPM Timing Belts are as much as 300% stronger than stock belts and deliver up to three times the heat resistance. You can count on RPM to hold up to the rigors of high horsepower required for interference engines.
This is a good all round kit for an high reving na or boosted engine.